1D0-720 Question #38: Real Exam Question with Answer & Explanation

The correct answer is A. To store and manipulate data values. Variables in JavaScript act as named containers that store and manipulate data values - numbers, strings, objects, etc. - allowing programs to track and transform information throughout execution. Option B describes CSS or HTML's role in page layout, not JavaScript variables. Opt

Client-Side Scripting and Media Queries

Question

In JavaScript, what is the purpose of variables?

Options

ATo store and manipulate data values
BTo define the layout of a webpage
CTo link JavaScript to HTML documents
DTo create graphical elements on the web page

Explanation

Variables in JavaScript act as named containers that store and manipulate data values - numbers, strings, objects, etc. - allowing programs to track and transform information throughout execution. Option B describes CSS or HTML's role in page layout, not JavaScript variables. Option C refers to <script> tags or src attributes used to link JS files to HTML, which is a separate concept. Option D describes the Canvas API or SVG elements, which are entirely different browser features.

Memory tip: Think of a variable as a labeled box - you name it, you put something in it, and you can take that something out or change it later. "Store and manipulate" maps directly to what boxes do: hold things and let you swap the contents.

Topics

#variables#data storage#JavaScript fundamentals#data manipulation

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